1 . 如图,已知抛物线
以坐标原点
为顶点,焦点
在
轴的正半轴上,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/14/69ff39b1-072c-485a-8d3a-0fb8e50343b7.png?resizew=252)
(1)求抛物线
的方程;
(2)过定点
的动直线
与抛物线
相交于
、
两点(
、
异于点
),设
、
的倾斜角分别为
、
,若
为定值,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee8d0fca9f6234cf35dd6953c8496fbc.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/14/69ff39b1-072c-485a-8d3a-0fb8e50343b7.png?resizew=252)
(1)求抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)过定点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac6b72b4d34c107acdfb9910d9a4f626.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2343929b02cc409367792b3081b6701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79b752f0f189e5d8666daea73e145dff.png)
您最近一年使用:0次
解题方法
2 . 如图,椭圆C:
(a>b>0)经过点P(2,3),离心率e=
,直线l的方程为y=4.
(Ⅰ)求椭圆C的方程;
(Ⅱ)AB是经过(0,3)的任一弦(不经过点P).设直线AB与直线l相交于点M,记PA,PB,PM的斜率分别为k1,k2,k3.问:是否存在常数λ,使得
?若存在,求λ的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d7aea48c44781a844b5c19191f70f61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
(Ⅰ)求椭圆C的方程;
(Ⅱ)AB是经过(0,3)的任一弦(不经过点P).设直线AB与直线l相交于点M,记PA,PB,PM的斜率分别为k1,k2,k3.问:是否存在常数λ,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41dc313844819d81f231ef58fa489606.png)
您最近一年使用:0次
2014·广东湛江·一模
解题方法
3 . 已知顶点为原点
的抛物线
的焦点
与椭圆
的右焦点重合,
与
在第一和第四象限的交点分别为
,
.
(1)若
是边长为
的正三角形,求抛物线
的方程;
(2)若
,求椭圆
的离心率
;
(3)点
为椭圆
上的任一点,若直线
、
分别与
轴交于点
和
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d2c71091168706706de1f01f0b0cb94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38387ba1cadfd3dfc4dea4ca9f613cea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffe22270178181c882369a9b9458430b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/168b3e4b1d6f04226fa2687a72a268b4.png)
(3)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b62769b7177ef4bc952dc1dd51d6b510.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/883f23ab75b490d6e9e03b8ff8b269c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4e16f56ea2ebb39c6945998b5c08e1c.png)
您最近一年使用:0次
13-14高二下·广东湛江·期末
名校
4 . 设命题
:“若
,则
有实根”.
(1)试写出命题
的逆否命题;
(2)判断命题
的逆否命题的真假,并写出判断过程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf105efd4cf5f580d0561e54d923e347.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c0a7696e876d0f31bbd21b1046ab511.png)
(1)试写出命题
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
(2)判断命题
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
您最近一年使用:0次
2014·广东湛江·一模
名校
解题方法
5 . 如图,点
是椭圆
的一个顶点,
的长轴是圆
的直径,
、
是过点
且互相垂直的两条直线,其中
交圆
于
、
两点,
交椭圆
于另一点
.
![](https://img.xkw.com/dksih/QBM/2014/4/28/1571681726406656/1571681732419584/STEM/51d6c4e654fd4e8897694465f0e6c1cc.png?resizew=261)
(1)求椭圆
的方程;
(2)求
面积的最大值及取得最大值时直线
的方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6951479694aec937a712901634a5a4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/471257463df494d995b2cbb686e5b027.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a3ef6da64080039ca5541c7d6b23d49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/2014/4/28/1571681726406656/1571681732419584/STEM/51d6c4e654fd4e8897694465f0e6c1cc.png?resizew=261)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db5e1441a49e782ff0ef46e776cde06a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
您最近一年使用:0次
2016-12-02更新
|
2519次组卷
|
9卷引用:2014届广东省湛江市高三高考模拟测试二理科数学试卷
(已下线)2014届广东省湛江市高三高考模拟测试二理科数学试卷(已下线)2014届广东省湛江市高三高考模拟测试二文科数学试卷四川省成都市双流中学2017高二上学期期中考试数学试题湖南省株洲市醴陵第二中学、醴陵第四中学2018届高三上学期两校期中联考数学(理)试题安徽省六安市舒城中学2017-2018学年高二下学期第一次统考(开学考试)数学(文)试题2020届山东省潍坊市高三下学期开学考试数学试题(已下线)强化卷03(3月)-冲刺2020高考数学之拿高分题目强化卷(山东专版)(已下线)备战2020年高考数学之考场再现(山东专版)05(已下线)第8篇——平面解析几何-新高考山东专题汇编
2014·广东湛江·一模
名校
解题方法
6 . 在如图所示的几何体中,四边形
为平行四边形,
,
平面
,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/2014/4/28/1571681095139328/1571681100988416/STEM/d2fd3c26c0c84c68ab2b1ec536cbb2ac.png?resizew=217)
(1)若
是线段
的中点,求证:
平面
;
(2)若
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ed8f7d3d7043d4b1eb98fc5c4e2fcd3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed04b01505bbd8a4ac0bc12e46f23bf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e41d3f7d55fcbaebc4e2450ac63a3dc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9c30de91ed42df92510cb64548fe704.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c05f315ab14567942f699983b60d04be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed6034301fc4110da89bdb0f46ad82ab.png)
![](https://img.xkw.com/dksih/QBM/2014/4/28/1571681095139328/1571681100988416/STEM/d2fd3c26c0c84c68ab2b1ec536cbb2ac.png?resizew=217)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6895bdd0286b8e2704fee9c343d82f57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/369eb8ad56da7dc1cdb7c43762be4bee.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a9cd88984f891a49ab451a06410a1f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4b820c84570da9c38d0a81c22788b76.png)
您最近一年使用:0次
2016-12-02更新
|
1477次组卷
|
3卷引用:2014届广东省湛江市高三高考模拟测试二理科数学试卷
(已下线)2014届广东省湛江市高三高考模拟测试二理科数学试卷宁夏银川唐徕回民中学2019-2020学年高二12月数学(理)试题甘肃省金昌市永昌县第一高级中学2020-2021学年高二上学期期末数学(理)试题
7 . 在平面直角坐标系内已知两点A(-1,0)、B(1,0),若将动点P(x,y)的横坐标保持不变,纵坐标扩大到原来的
倍后得到点Q(x,
y),且满足
·
="1."
(1)求动点P所在曲线C的方程;
(2)过点B作斜率为-
的直线L交曲线C于M、N两点,且
+
+
=
,试求△MNH的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b62f982dcc65613094acbaccb722d5e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/894e3e8643d977eaccccf09842584954.png)
(1)求动点P所在曲线C的方程;
(2)过点B作斜率为-
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d5989c84e320b504511f23eeb6e7357.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/716c8814c6e33b4f44d18a9139d6c8f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e1ea5146f3e60f428bee302d1df956d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d35031a79de6c63067f6afd9c44e1e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aabfd737d5b5db483cd935839dad79e9.png)
您最近一年使用:0次
12-13高二上·广东湛江·期末
解题方法
8 . 直线
与椭圆
交于A(x1,y1),B(x2,y2)两点,已知
=(ax1,by1),
=(ax2,by2),若
且椭圆的离心率
,又椭圆经过点
,O为坐标原点.
(1)求椭圆的方程;
(2)试问:△AOB的面积是否为定值?如果是,请给予证明;如果不是,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fb223b8777ab973970491bf0dcc6806.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d75372224713240b738e79e1bc4e8e97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3113f87863c0ba1b5253e44d09c4b230.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff588a17fd591a6ae0efde709ab9afe3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5de85df85401e7e8da683ea4a784963c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/091b43a8abc57a695a37c2884845c6d6.png)
(1)求椭圆的方程;
(2)试问:△AOB的面积是否为定值?如果是,请给予证明;如果不是,请说明理由.
您最近一年使用:0次
9 . 已知如图(1),梯形
中,
,
,
,
、
分别是
、
上的动点,且
,设
(
),沿
将梯形
翻折,使平面
平面
,如图(2)
(Ⅰ)求证:平面
平面
;
(Ⅱ)若以
、
、
、
为顶点的三棱锥的体积记为
,求
的最大值;
(Ⅲ)当
取得最大值时,求二面角
的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef699f5dc072b853cfe700c6f1abbbae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1088bd700714ca910c405eb1dddb696c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0955e0e56ed864bed2ce5c41cbd7f9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae52d81ce25f80cb3f5b0b1be739b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/781e56e25b06e8512793b95b76d0d966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4007738bd034ff1dce46c35ef1e8e303.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0215e13a9fb5574d5194aeb9507a98aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ba3fc3042013acf7dfbd895cb58abc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e64f5fd229218d333adbe9b324e80157.png)
(Ⅰ)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bfc40a158dfae709a776e9a5a83dda5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
(Ⅱ)若以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d479a86a1711709b2d100fe4daf3e7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d479a86a1711709b2d100fe4daf3e7cf.png)
(Ⅲ)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d479a86a1711709b2d100fe4daf3e7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/371b9cfa9567cbbff5df4a4b0409b146.png)
![](https://img.xkw.com/dksih/QBM/2012/2/17/1570750156570624/1570750161977344/STEM/b7faa73e9f434a3fb70ad85cc84b189d.png?resizew=444)
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11-12高三·广东湛江·阶段练习
解题方法
10 . 如图,已知
为椭圆
的右焦点,直线
过点
且与双曲线
的两条渐近线
分别交于点
,与椭圆交于点
.
![](https://img.xkw.com/dksih/QBM/2012/2/17/1570745827024896/1570745832595456/STEM/d47c47f945cb405e8d60e80192aa2b43.png?resizew=296)
(1)若
,双曲线的焦距为4,求椭圆方程;
(2)若
(
为坐标原点),
,求椭圆的离心率
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d7aea48c44781a844b5c19191f70f61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f82eb4ba631d0f50d848aa6e576b379.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19f3fa0b40fb0d9b8c62e37316ab3b04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44434b647ec546fe787e2164e0be6cd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://img.xkw.com/dksih/QBM/2012/2/17/1570745827024896/1570745832595456/STEM/d47c47f945cb405e8d60e80192aa2b43.png?resizew=296)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8aae4a5d11436954ee799c4c6fc11aae.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d1ed8d4082ea8c9d98f307ffe87dd45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/374b40401f753eec53665d3f06e30bdf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/168b3e4b1d6f04226fa2687a72a268b4.png)
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